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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.launcher2;
     18 
     19 import android.appwidget.AppWidgetHostView;
     20 import android.content.Context;
     21 import android.view.LayoutInflater;
     22 import android.view.MotionEvent;
     23 import android.view.View;
     24 import android.view.ViewConfiguration;
     25 
     26 import com.android.launcher.R;
     27 
     28 /**
     29  * {@inheritDoc}
     30  */
     31 public class LauncherAppWidgetHostView extends AppWidgetHostView {
     32     private boolean mHasPerformedLongPress;
     33 
     34     private CheckForLongPress mPendingCheckForLongPress;
     35 
     36     private LayoutInflater mInflater;
     37 
     38     public LauncherAppWidgetHostView(Context context) {
     39         super(context);
     40         mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     41     }
     42 
     43     @Override
     44     protected View getErrorView() {
     45         return mInflater.inflate(R.layout.appwidget_error, this, false);
     46     }
     47 
     48     public boolean onInterceptTouchEvent(MotionEvent ev) {
     49         // Consume any touch events for ourselves after longpress is triggered
     50         if (mHasPerformedLongPress) {
     51             mHasPerformedLongPress = false;
     52             return true;
     53         }
     54 
     55         // Watch for longpress events at this level to make sure
     56         // users can always pick up this widget
     57         switch (ev.getAction()) {
     58             case MotionEvent.ACTION_DOWN: {
     59                 postCheckForLongClick();
     60                 break;
     61             }
     62 
     63             case MotionEvent.ACTION_UP:
     64             case MotionEvent.ACTION_CANCEL:
     65                 mHasPerformedLongPress = false;
     66                 if (mPendingCheckForLongPress != null) {
     67                     removeCallbacks(mPendingCheckForLongPress);
     68                 }
     69                 break;
     70         }
     71 
     72         // Otherwise continue letting touch events fall through to children
     73         return false;
     74     }
     75 
     76     class CheckForLongPress implements Runnable {
     77         private int mOriginalWindowAttachCount;
     78 
     79         public void run() {
     80             if ((mParent != null) && hasWindowFocus()
     81                     && mOriginalWindowAttachCount == getWindowAttachCount()
     82                     && !mHasPerformedLongPress) {
     83                 if (performLongClick()) {
     84                     mHasPerformedLongPress = true;
     85                 }
     86             }
     87         }
     88 
     89         public void rememberWindowAttachCount() {
     90             mOriginalWindowAttachCount = getWindowAttachCount();
     91         }
     92     }
     93 
     94     private void postCheckForLongClick() {
     95         mHasPerformedLongPress = false;
     96 
     97         if (mPendingCheckForLongPress == null) {
     98             mPendingCheckForLongPress = new CheckForLongPress();
     99         }
    100         mPendingCheckForLongPress.rememberWindowAttachCount();
    101         postDelayed(mPendingCheckForLongPress, ViewConfiguration.getLongPressTimeout());
    102     }
    103 
    104     @Override
    105     public void cancelLongPress() {
    106         super.cancelLongPress();
    107 
    108         mHasPerformedLongPress = false;
    109         if (mPendingCheckForLongPress != null) {
    110             removeCallbacks(mPendingCheckForLongPress);
    111         }
    112     }
    113 }
    114